2.3.15 HDMP-28

HDMP-28 #

Common Nomenclature Methylnaphthidate
Street & Reference Names N/A
Reference Dosage Threshold 5mg+; Light 10mg+; Medium 20mg+; Strong 40mg+ [Oral, Drugs-Forum]
Threshold 8mg+; Light 10mg+; Common 15mg+; Strong 30mg+ [Oral, TripSit]
Anticipated: Onset / Duration 5 Minutes / 3 Hours
Maximum Dose Experienced 10mg+10mg+10mg+10mg+10mg
Form Powder
RoA Insufflated
Source / Jurisdiction Internet / UK


The supply of HDMP-28 in the UK was strangled almost at birth. It was subjected to a government TCDO shortly after it began to emerge on the markets, during the early months of 2015. The same TCDO schedule also included a number of more established chemicals, specifically 3,4-CTMP, EPH, IPPH, and PPH.

My own sample had been imported from Canada, by a fellow researcher, and was forwarded after his own experiments had disappointed him.

I subsequently reported my experience, in December 2014, in the following terms:

My usual and preferred RoA is oral, but on this occasion, in an attempt to reduce the anticipated period of residue stim, I decided to insufflate. I snorted a line of between 5mg and 10mg. I then repeated this exercise approximately every hour for the next few hours. It was a bit of a rough ride. The experience itself was nice enough, but the body load was high.

The nose-burn was significant. It was much harsher for me than, for example, MPA or 3-FPM. Perhaps I had too much, but later on, a mild headache developed. I experienced the usual stim-dilated pupils, with more than the usual jaw tension.

From reading other reports I was expecting a fairly short residue, but I found it to be lengthy. Ending the tests at approximately 8pm, I was still feeling the influence the following late-afternoon, and I had no sleep at all. This was way too much for my tastes.

Certainly it was a buzz. It was intense, very strong, and long lasting, but I think a lot of work is required to determine the correct dosage, and perhaps the ideal RoA.

I hope this helps other potential researchers, to whom I would advise: be particularly careful with the dose. Start lower than I did, and watch out for compulsive redosing.

Whilst I cannot be absolutely certain that this chemical caused the general malaise which followed this experiment, I have no intention of repeating the exercise to confirm. Take it easy.

I never explored further, and indeed, I binned the remaining powder.

For the committed UK enthusiast Canada was the online source of a number of niche research chemicals

For the committed UK enthusiast Canada was the online source of a number of niche research chemicals